HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions for Biology

With the help of suitable diagram define 'bagging' and 'tagging' of  flower.

Define Osmotic pressure.

What is Biofortification? Explain selective breeding with suitable example.

Answer each question in ‘One’ sentence only:

Define stock and scion.

The biological scissor is ______.

Give the applications of the PCR technique.

Explain selective breeding. Give any 'two' examples and their nutrients obtained by selective breeding. 

Give an account of mutation breeding with examples.

Describe briefly various steps of plant breeding methods.

The bacterium which causes a plant disease called crown gall is _______________.

In vitro amplification of DNA or RNA segment is known as ___________.

The enzyme nuclease hydrolyses ______ of polynucleotide chain of DNA.

The recognition sequence of restriction enzymes is generally ______ nucleotide long.

Explain the properties of a good or ideal cloning vector for rDNA technology.

A PCR machine can raise the temperature up to 100°C but after that, it is not able to lower the temperature below 70°C automatically. Which step of PCR will be hampered first in this faulty machine? Explain why?

Multiple choice question.

Who proposed that the first form of life could have come from per- existing nonliving organic molecules?

Give the steps in PCR or polymerase chain reaction with suitable diagrams.

Multiple choice question.

The sequence of origin of life may be-

Multiple choice question.

Select the analogous organs.

Multiple choice question.

Archaeopteryx is known as missing link because it is a fossil and share characters of both